Center button issues (minor water damage?)

Hey guys,

So I took an 16gb 3G off of my grandfather's hands in an effort to sell it (as he had two for some reason). Anyway... I soon find out that the center button works about 75% of the time and sometimes refuses to work for a few hours - its under warranty but when I take it to Apple they tell me water must of sneaked up the charging area and therefore the warranty is no good.

The phone works in perfect condition other than this minor problem which only seems to happen every once in a while..... is there anyway to fix it? What am I looking at in terms of costs? Any insight is appreciated. Thanks

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